Door lock



A. wmz l'2,382,762

DOOR LOCK Filed sept. s, 1943 HEL 181 jj I 6 Patented Aug. 14, 1945 DOOR LOCK Albert Wrz, Basel, Switzerland Application September 8, 1943, Serial No.501,574 In Switzerland August 12, 1942 8 Claims.

The invention refersto a selfclosing door-lock which eiTects the locking of the door as soon as it comes into contact with the doorframe. The bolt of the lock has one slanting side (bevel) tending to press the door against its frame and y is provided with a spring tending to push the bolt outward, and is further provided with an arrangement to arrest the bolt in a position which is withdrawn suiliciently to allow the opening of the door, as soon as the arresting lever of the lock contacts a corresponding part of the dborframe.

The door is opened as usual by the action oi a doorhandle which, upon being pressed down, acts on a lever which is onthe inside of the lock. This lever in turn withdraws thebolt, against the force of springs, a distance which is sufficient to free the bolt casing inside the frame and for the arresting mechanism to take effect.

It is evidently impossible to ensure that the arresting mechanism has become effective before the door can be opened unless the opening of the door is delayed by some means or other independent of the mainbolt of the lock. If the handle is pressed down sufficiently to open the door, but not far enough for the arresting lever to operate, the bolt, as soon as the doorhandle is released, returns into its protruding position and the lock, instead of closing the door, prevents the door from being closed altogether.

In order to circumvent this possibility, it has been proposed to delay the opening of the door Iby a secondary bolt which is pushedI outward by the same lever which simultaneously withdraws the mainbolt. The secondary bolt in this case is released by the lever shortly after the mainbolt has been arrested and is withdrawn door to be opened.

This arrangement apart from rendering themanipulation'of the doorhandle unduly stiff, has severaldisadvantages, i. e., it is diflicult to provide for variation of play between the door andl the frame, the Wear of the'lever which must push the secondary lever forward `and release itat a given point tends to shift the relative positions of the doorhandle, the one in which the door is released and the other in which the mainbolt is being secured. Also the secondary bolt must travel too far in order to operate satisfactorily.

The invention as described circumvents these disadvantages by providing a secondaryfbolt on or in the mainbolt which is further so arranged, that it can protrude beyond the outer edge of.

the mainbolt or can be completely withdrawn therein. It is forced to protrude beyond the edge of the mainbolt until the mainbolt has been arrested and after this stage of the opening movement it begins to be withdrawn and finally is sufficiently far to the other side of the mainbolt edge to be likewise free of the casing in the doorfrarne.

The invention therefore unites the mainbolt and the secondary bolt into one unitary construction. x

It is immaterial, whether the secondary bolt is provided inside the mainbolt or the mainbolt is inside the secondary bolt, or the secondary fbolt is on top, below, in front of or behind the mainbolt. This would-only Iconstitute a preference in manufacture.

The secondary bolt is so constructed that the extent of its overtopping the edge'of the mainbolt is sufiicient to take care of kany reasonable shrinkage of the door or the frame (increased width of slit) to be bridged over V-for the reason above explained.

This invention ensures the advancing motion of the secondary bolt by a spring which, with its far end is fastened to the mainbolt of the lock whereas the receding motion of the secondary bolt is controlled indirectly by the mainlever of the lock and therefore fby the doorhandle.

An advantage of the invention resides therefore in the distance which the secondary bolt has to travel to ensure that the desired effect-is shortened by the distance it travels together with the mainbolt.

The secondary bolt which protrudes but a short distance can be made of light construction and requires only a weak spring. Also its easy action requires no appreciable exertion to manipulate the doorhandle, etc.

The accompanying drawing shows an example of a lock according to the invention.

Figures 1 to 4 are side views showing the position of the various parts of the mechanism in four dierent stages of opening or closing, wherein Figure 1 shows the lock when the door is closed and I Figure 4 shows the lock when the door is open and the handle has been released. Figures 2 and 13 show successive intermediate stages in the proc- 4ess of opening the door.

Figures 5 and 6 are horizontal sections corresponding to Figure 1 and Figure 4 respectively.

The lock is assembled and provided betweenl a pair of side plates l. A mainlever 3 has a square hole therein, fitting the square section of an axle 2, the latter in turn having a doorhandle 5 on each side. The mainlever 3 is shaped to resemble the cock or hammer of a rie, i. e., it carries at its working end two projections or arms 6 and I4. The shorter projection 6 acts on a mainbolt 'I pushing it inward when the doorhandle is pressed down. The longer arm I4 of the mainlever 3 is curved in a circle the centre of which is located in the centre of the axle 2. The purpose of the part I4 will be explained Ibelow.

A downward pressure of the doorhandle 5 is counteracted by a spring 4 tending to turn the mainlever 3 counterclockwise and thereby bringing the doorhandles 5 upon release back into the normal horizontal position. The withdrawing effect of the mainlever 3 by means of the projection 6 on the mainbolt 'I is counteracted by a spring 8 which tends to push the mainbolt I outward.

The manbolt is grooved. This groove provides a sliding bearing for an auxiliary bolt 9 in its sliding motion relative to the mainbolt 1. A spring I is provided in the mainbolt which tendsto force the auxiliary bolt outward. A double lever I has its upper working arm fitting into a groove I5a of the auxiliary bolt 9 and is arranged to push this bolt 9 either way. i

The mainbolt 1 is provided with a locking device I2 and I3 which locks the mainbolt I in the position of Figure 2r, i. e., withdrawn practically flush with the narrow end of the lockcasing. The locking device comprises the arm I2 which projects slightly beyond the lockcasing through a slot provided for this purpose and which swings on a vertical axle in the axis of a small spring I I. This spring II tends to bring the arm I2 forward but, in the position of Figure l, it is prevented from such movement by the mainbolt I against which the tooth I3 of the locking device I2 is contacting until in the position of Figure 2 the right hand edge I9 of the recess in the mainlever has travelled beyond the tooth I3, thus allowing the locking device to become effective (Figures 2 and 4) On closing the door the locking device is released by a corresponding stop arranged in the doorfrarne.

The longer circular arm I4 of the mainlever slides along a roller or pin II, which limits its movement in one direction and acts on the lever part of the auxiliary lever I5, provided the position of the mainbolt brings this lever into its orbit as in Figure 4.

The auxiliary lever I5 travelling with the mainbolt may be moved by the roller I'I.

Starting from the position of the lock shown in Figure 1 which corresponds tothe door being closed the operation of the lock is as follows.

On pressing down the doorhandle 5, the mainlever 3 pushes the mainbolt I inward, by means of projection 6 operating against the force of both springs 4 and 8.

The auxiliary lever I5 is carried along by the mainbolt 1 without any change in their relative positions, until the mainbolt 'I is locked by the locking device I2 and I3. This is the position of Figure 2. If the doorliandle is pressed down further as in Figure 3, the mainbolt I recedes further beyond the position required for locking it. When this position is being passed, the auxiliary lever I5 is pressed against the baffle I1 by the retrograde movement of the mainbolt I and is thereby moved in the opposite direction. The auxiliary lever I5 withdraws the auxiliary bolt 9 against the action of spring I 0 into the mainbolt. The auxiliary bolt 9 being fully withdrawn, the door is set free for opening (position of Fig. 3).

On releasing the doorhandle the mainlever 3 is turned counter-clockwise by the spring 4 until the projection 6 contacts against the roller I1. Then the mainbolt is permitted to travel outward again but not beyond its locked position (Figure The auxiliary lever I5 is thus set free from pres- ,sure against the roller I'I and the spring I0 causes the auxiliary bolt to protrude again beyond the edge of the mainbolt. This, however, is only transitory because the auxiliary lever I5 is now in reach of the circular arm I4 of the mainlever which, in swinging back into its rest position, pushes the auxiliary lever I5 over as previously accomplished by the baffle, thus again withdrawing the auxiliary bolt 9. This is the position shown in Fig. 4 which corresponds to the door being open with the handle released.

On closing the door the locking device is released by contact with a stop xed to the doorframe, both bolts being propelled by their respective springs moving forward and the door closes automatically by pressure of the oblique iiank of the mainbolt against the corresponding edge of the casing in the doorframe.

The action of the springs in the mechanism may be partly or in toto substituted or supplemented by hydraulic, pneumatic, electromagnetic push or pull, etc., devices.

According to the invention the lock opens by four distinct stages. In the yfirst stage the mainbolt-the secondary bolt still protruding--is withdrawn well free from the casing of the doorframe and arrested in this position (Fig. 2). In the second stage the auxiliary bolt is withdrawn likewise well free from the casing in the doorframe. Both stages I and 2 are brought about by pressing down the doorhandle, stages 3 and 4 by releasing it.

Releasing the doorhandle brings about stage three, i. e., a transitory advancing movement of the secondary bolt (as in Figure 2) which, however, is followed immediately by its renewed complete withdrawal (stage four), both movements being actuated by the spring 4 which acts on the mainlever 3.

Stage 3 may be eliminated if desired by arresting the secondary bolt in its withdrawn position in a known manner. On Contact of the door with the frame the mainbolt is (or eventually both bolts are) released and the lock thereupon effects the closing of the door itself consistently in one stage.

I claim as my invention:

1. A doorlock comprising a casing, a mainbolt slidably arranged in the casing and having a groove therein; an auxiliary bolt slidably arranged in the mainbolt, an auxiliary lever pivotally mounted on the mainbolt and having one end in contact with the auxiliary bolt, and a main operating lever adapted to contact and operate the mainbolt when the door is to be opened.

2. A doorlock comprising a casing, a mainbolt slidably arranged in the casing and having a groove therein; an auxiliary bolt slidably arranged in the mainbolt, an auxiliary lever pivotally' mounted on the mainbolt and having one end in contact with the auxiliary bolt, a main operating lever adapted to contact and operate the mainbolt when the door is to be opened, and a fixed member mounted on the casing against which the auxiliary lever abuts upon movement of the main bolt to cause relative movement between both bolts upon further retracting movement of the mainbolt.

3. A doorlock comprising a casing, a mainbolt slidably arranged in the casing and having a groove therein; an auxiliary bolt slidably arranged in the mainbolt, an auxiliary lever pivotally mounted on the mainbolt and having one end in contact with the auxiliary bolt, a main operating lever adapted to contact and operate the mainbolt when the door is to be opened, a xed member mounted on the casing against which the auxiliary lever abuts upon movement of the main bolt to cause relative movement between both bolts upon further retracting movement of the mainbolt, and a spring for the mainbolt and a second spring for the operating lever to urge the mainbolt and operating lever in the initial positions.

4. Self closing door lock comprising a main bolt and an auxiliary bolt, said bolts being movable against elastic opposition, detent means engaging said main bolt in its retracted position to retain it therein, said detent means being operable by closure of the door to release said main bolt, a door handle in driving engagement with said main bolt, means for returning said door handle to a normal position when said handle is released after movement away from said position, and drive means between said main and auxiliary bolts, said drive means being operated by said door handle in its return to normal position to retract the auxiliary bolt after retention of said main bolt by said detent means.

5. Self closing door lock according to claim 4, wherein the auxiliary bolt slides in a slot in the main bolt and the drive means extends through an opening of the'main bolt into said slot.

6. Self closing door lock according to claim 4, wherein the drive means is a lever pivoted to the main bolt and having one arm extending into a notch in' the auxiliary bolt and another arm extending into the path of movement of an extension on the door handle.

7. Self closing door lock according to claim 4,

wherein the auxiliary bolt slides in a slot in the main bolt and the drive means extends through an opening of the main bolt into said slot, said drive means including a member extending into a notch in the auxiliary bolt to couple said bolt to the main bolt whereby said auxiliary bolt is retracted along with said main bolt.

8. Self closing door lock according to claim 4, wherein the drive means is a lever pivoted to the main bolt and having one arm extending into a notch in the auxiliary bolt and another arm extending into the path of movement of an extension on the door handle, and wherein a stop is provided engaging the lever during retraction of the main bolt whereby further retraction of the main bolt rocks said lever to retract the auxiliary bolt relatively to thev main bolt.

ALBERT WIRZ. 

